Not being the original poster, I definetely think the question is very interesting if you change it just a bit. I 'm convinced that there are differente levels of work you can do to an image in photoshop.
At a very bare minimun, you can distinguish two approches: one that is to do in digital what was always done to film at the lab: levels, contrast, saturation, color shifts, USM, etc. I like to think of this editing tools as the ones that can be applied in batch to a bunch of shot-in-similar-conditions images.
But then, there are other photoshop tools that are applied just in some images and that are particular of that image alone: skin softening, differential USM, b&w convertions (ok, this one is arguable), cloning, background replacement, etc.
So, I think we 'll all agree that every image nowadays is applied some of the "type 1" editing tools, but the question is: how many of your images you treat in a case-by-base, one-by-one, dedicated way?
Talking about tools I try to do all the type 1 editing at the raw conversor (Capture one) and only open photoshop for the rest.
Martin
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Martin Arpon
(english not my native language)